Dell PowerEdge FX2/FX2s - Manual (Page 205)

Figure 27. Uplink Failure Detection
How Uplink Failure Detection Works
UFD creates an association between upstream and downstream interfaces. The association of uplink and
downlink interfaces is called an uplink-state group.
An interface in an uplink-state group can be a physical interface or a port-channel (LAG) aggregation of
physical interfaces.
An enabled uplink-state group tracks the state of all assigned upstream interfaces. Failure on an upstream
interface results in the automatic disabling of downstream interfaces in the uplink-state group. As a
result, downstream devices can execute the protection or recovery procedures they have in place to
establish alternate connectivity paths, as shown in the following illustration.
Uplink Failure Detection (UFD) 205